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Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region
Univ Innsbruck, Inst Astro & Teilchenphys, Technikerstr 25-8, A-6020 Innsbruck, Austria..
Univ Napoli Federico II, Dept Phys, Via Cinthia 9, I-80126 Naples, Italy.;Ist Nazl Fis Nucl, Sez Napoli, Via Cinthia 9, I-80126 Naples, Italy.;INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy..
Univ Napoli Federico II, Dept Phys, Via Cinthia 9, I-80126 Naples, Italy.;Millennium Inst Astrophys MAS, Nuncio Monsenor Sotero Sanz 100, Santiago, Chile.;Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Spain..
Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA.;Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA..
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2020 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 634Article in journal (Refereed) Published
Abstract [en]

Context. Variability has proven to be a powerful tool to detect active galactic nuclei (AGN) in multi-epoch surveys. The new-generation facilities expected to become operational in the next few years will mark a new era in time-domain astronomy and their wide-field multi-epoch campaigns will favor extensive variability studies.Aims. We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South, performed in the r band and covering a 2 sq. deg area. The analysis complements a previous work, in which the first half of the area was investigated. We provide a reliable catalog of variable AGN candidates, which will be critical targets in future variability studies.Methods. We selected a sample of optically variable sources and made use of infrared data from the Spitzer mission to validate their nature by means of color-based diagnostics.Results. We obtain a sample of 782 AGN candidates among which 12 are classified as supernovae, 54 as stars, and 232 as AGN. We estimate a contamination less than or similar to 20% and a completeness similar to 38% with respect to mid-infrared selected samples.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2020. Vol. 634
Keywords [en]
galaxies: active, infrared: galaxies, surveys
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-269466DOI: 10.1051/0004-6361/201937108ISI: 000513142300001OAI: oai:DiVA.org:kth-269466DiVA, id: diva2:1413325
Note

QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10Bibliographically approved

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Falocco, Serena

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